If you want to see a comparison of 2.5" vs. 3" exhaust on the same engine with dyno and discussion, watch this Engine Masters video:
https://youtu.be/_PVXvHkr-Vs
Personally, I wouldn't bother with a 3" exhaust on a street car, but that's just me.
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1966 Pontiac GTO (
restoration thread)
1998 BMW 328is (
track rat)
2023 Subaru Crosstrek Limited (
daily)
View my photos: Caught in the Wild